<html>
<head>
<meta charset='utf-8' />
</head>
<body>
我的密码只有四位你能猜出来吗? ${msg}
<form action='' method='post'>
<label>用户名</label><input type='text' name='usr' value='yang'><br>
<label>密码</label><input type='password' name='pwd'><br>
<input type='submit' value='登录'>

</form>
</body>
</html>